E? No walls, no pillars, no columns, no barriers, no partitions, no septa..... Usually there are plenty of them. Everywhere. They used to appear all of a sudden. And nothing like that here. Nothing covers nor veils nor hides anything. No usual building elements that stop and disturb seeing. No obstacles for the eyesight. Nothing guides your eyes. Nothing guides your steps. No corridors. No rooms. No halls. You can see through and thoroughly.
However, any time the walls can be raised. In any moment and in any place. Because the roof, this self-supporting roof, self-hovering roof, flying roof can be pushed ahead or aside or away. It's enough to blow. It's enough to swing a hand.